SX8661I07AULTRT Semtech, SX8661I07AULTRT Datasheet - Page 26

• Manufacturer Part Number: SX8661I07AULTRT
• Description: IC, Capacitive Button Touch And Proximity Controller, 8 SENSOR, MLPQ-28
• Manufacturer: Semtech

Specifications of SX8661I07AULTRT

• Controller Type: Capacitive Touch Screen
• Ic Interface Type: I2C
• Supply Voltage Range: 2.7V To 3.6V
• Operating Temperature Range: -40°C To +85°C

SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Host NVM mode
Figure 22
The writing of the host towards the NVM is not done directly but done in 2 steps (Figure 22).
In the first step the host writes to the SPM (as in Figure 21). In the second step the host signals the SX8661 to
copy the SPM content into the NVM.
Initially the NVM memory is empty and it is required to determine a valid parameter set for the application. This
can be done during the development phase using dedicated evaluation hardware representing the final
application. This development phase uses probably initially the host SPM mode which allows faster iterations.
Once the parameter set is determined this can be written to the NVM over the I2C using the 2 steps approach by
the host or a dedicated programmer for large volumes production (as described in the paragraphs 6.6 and 6.7).
3.13 Power Management
The SX8661 uses on-chip voltage regulators which are controlled by the on-chip microprocessor. The regulators
need to be stabilized with an external capacitor between VANA and ground and between VDIG and ground (see
Table 5). Both regulators are designed to only drive the SX8661 internal circuitry and must not be loaded
externally.
3.14 Clock Circuitry
The SX8661 has its own internal clock generation circuitry that does not require any external components. The
clock circuitry is optimized for low power operation and is controlled by the on-chip microprocessor. The typical
operating frequency of the oscillating core is 16.7MHz from which all other lower frequencies are derived.
3.15 I2C interface
The I2C interface allows the communication between the host and the SX8661.
The I2C slave implemented on the SX8661 is compliant with the standard (100kb/s) and fast mode (400kb/s)
The default SX8661 I2C address equals 0b010 1011.
A different I2C address can be programmed by the user in the NVM.
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
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